The West Bengal CID on Monday said it would write to Facebook authorities in the US, requesting them to delete malicious web contents circulated on the social networking site against Chief Minister Mamata Banerjee and other Trinamool leaders.

The CID sleuths said they would also try to locate the IP address from where the actual caricature posted against Mamata and Union Railway Minister Mukul Roy originated.

The state investigating agency began its probe into the matter after a complaint lodged with the Salt Lake electronic complex police station by Sumon Naskar on April 9.

The complainant protested against the caricatures and posts made against the chief minister, central ministers and other senior Trinamool leaders on social networking websites.